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Pennzoil, Havoline or Castrol ? I switched to synthetic @ 7500 miles and ran M1 5w30, 10w30 and Castrol Syntec 10w30 in my bone stock Subaru Legacy GT(2.5L Turbo 13.5psi). I started having significant oil consumption @ ~30k miles and I accepted it as a consequence of my hard driving(Multiple...

I've got a 2005 Subaru Legacy GT (2.5L Turbo 13.5PSI) and I'm not liking the oil consumption with Mobil 1 5/10W-30. I wanted to try GC with a 12 cst right between most 5/10W-30 and 5/10W-40 oils, but my service advisor said, "It's too thin" and I know he is wrong but I won't go there unless I...

Here is some history: 3700/1 Month - 1st Oil Change - OEM Dino 5w30 7300/2 Months - 2nd Oil Change - Mobil 1 10w30 12,900/3.5 Months - 3rd Oil Change - Mobil 1 EP 10w30 18,100/1 Month - 4th Oil Change - Mobil 1 EP 10w30 I drive the car hard and it is too addictive as indicated by the 5000...